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<h1>luaposix 36.3</h1>
<ul>
<li><a href="../index.html">Index</a></li>
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<h2>Contents</h2>
<ul>
<li><a href="#Functions">Functions</a></li>
<li><a href="#Constants">Constants </a></li>
</ul>
<h2>Modules</h2>
<ul class="nowrap">
<li><a href="../modules/posix.html">posix</a></li>
<li><a href="../modules/posix.ctype.html">posix.ctype</a></li>
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<li><a href="../modules/posix.sched.html">posix.sched</a></li>
<li><a href="../modules/posix.signal.html">posix.signal</a></li>
<li><strong>posix.stdio</strong></li>
<li><a href="../modules/posix.stdlib.html">posix.stdlib</a></li>
<li><a href="../modules/posix.sys.msg.html">posix.sys.msg</a></li>
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<div id="content">
<h1>Module <code>posix.stdio</code></h1>
<p>A few Standard I/O functions not already in Lua core.</p>
<p>
</p>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#ctermid">ctermid ()</a></td>
<td class="summary">Name of controlling terminal.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#fdopen">fdopen (fd, mode)</a></td>
<td class="summary">Create a Lua file object from a file descriptor.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#fileno">fileno (file)</a></td>
<td class="summary">File descriptor corresponding to a Lua file object.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#rename">rename (oldpath, newpath)</a></td>
<td class="summary">Change the name or location of a file</td>
</tr>
</table>
<h2><a href="#Constants">Constants </a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#posix.stdio">posix.stdio</a></td>
<td class="summary">Stdio constants.</td>
</tr>
</table>
<br/>
<br/>
<h2 class="section-header "><a name="Functions"></a>Functions</h2>
<dl class="function">
<dt>
<a name = "ctermid"></a>
<strong>ctermid ()</strong>
</dt>
<dd>
Name of controlling terminal.
<h3>Returns:</h3>
<ol>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
controlling terminal for current process
</ol>
<h3>See also:</h3>
<ul>
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/ctermid.html">ctermid(3)</a>
</ul>
</dd>
<dt>
<a name = "fdopen"></a>
<strong>fdopen (fd, mode)</strong>
</dt>
<dd>
Create a Lua file object from a file descriptor.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">fd</span>
<span class="types"><span class="type">int</span></span>
file descriptor
</li>
<li><span class="parameter">mode</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
the mode in which to open the file descriptor
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><span class="type">file</span></span>
Lua file object <em>fd</em>, if successful
</ol>
<h3>Or</h3>
<ol>
<li>
nil</li>
<li>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
error message</li>
<li>
<span class="types"><span class="type">int</span></span>
errnum</li>
</ol>
<h3>See also:</h3>
<ul>
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/fdopen.html">fdopen(3)</a>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> fdopen = <span class="global">require</span> <span class="string">"posix.stdio"</span>.fdopen
<span class="keyword">local</span> STDOUT_FILENO = <span class="global">require</span> <span class="string">"posix.unistd"</span>.STDOUT_FILENO
stdout = <span class="function-name">fdopen</span> (STDOUT_FILENO, <span class="string">"w"</span>)</pre>
</ul>
</dd>
<dt>
<a name = "fileno"></a>
<strong>fileno (file)</strong>
</dt>
<dd>
File descriptor corresponding to a Lua file object.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">file</span>
<span class="types"><span class="type">file</span></span>
Lua file object
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><span class="type">int</span></span>
file descriptor for <em>file</em>, if successful
</ol>
<h3>Or</h3>
<ol>
<li>
nil</li>
<li>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
error message</li>
<li>
<span class="types"><span class="type">int</span></span>
errnum</li>
</ol>
<h3>See also:</h3>
<ul>
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/fileno.html">fileno(3)</a>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> stdio = <span class="global">require</span> <span class="string">"posix.stdio"</span>
<span class="keyword">local</span> unistd = <span class="global">require</span> <span class="string">"posix.unistd"</span>
<span class="global">assert</span> (stdio.<span class="function-name">fileno</span> (<span class="global">io</span>.stdout) == unistd.STDOUT_FILENO)</pre>
</ul>
</dd>
<dt>
<a name = "rename"></a>
<strong>rename (oldpath, newpath)</strong>
</dt>
<dd>
Change the name or location of a file
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">oldpath</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
</li>
<li><span class="parameter">newpath</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><span class="type">int</span></span>
<code>0</code>, if successful
</ol>
<h3>Or</h3>
<ol>
<li>
nil</li>
<li>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
error message</li>
<li>
<span class="types"><span class="type">int</span></span>
errnum</li>
</ol>
<h3>See also:</h3>
<ul>
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html">rename(2)</a>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> ok, errmsg = P.<span class="function-name">rename</span> (oldpath, newpath)
<span class="keyword">if</span> <span class="keyword">not</span> ok <span class="keyword">then</span> <span class="global">error</span> (errmsg) <span class="keyword">end</span></pre>
</ul>
</dd>
</dl>
<h2 class="section-header "><a name="Constants"></a>Constants </h2>
<dl class="function">
<dt>
<a name = "posix.stdio"></a>
<strong>posix.stdio</strong>
</dt>
<dd>
Stdio constants.
Any constants not available in the underlying system will be <code>nil</code> valued.
<h3>Fields:</h3>
<ul>
<li><span class="parameter">_IOFBF</span>
<span class="types"><span class="type">int</span></span>
fully buffered
</li>
<li><span class="parameter">_IOLBF</span>
<span class="types"><span class="type">int</span></span>
line buffered
</li>
<li><span class="parameter">_IONBF</span>
<span class="types"><span class="type">int</span></span>
unbuffered
</li>
<li><span class="parameter">BUFSIZ</span>
<span class="types"><span class="type">int</span></span>
size of buffer
</li>
<li><span class="parameter">EOF</span>
<span class="types"><span class="type">int</span></span>
end of file
</li>
<li><span class="parameter">FOPEN_MAX</span>
<span class="types"><span class="type">int</span></span>
maximum number of open files
</li>
<li><span class="parameter">FILENAME_MAX</span>
<span class="types"><span class="type">int</span></span>
maximum length of filename
</li>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="comment">-- Print stdio constants supported on this host.
</span><span class="keyword">for</span> name, value <span class="keyword">in</span> <span class="global">pairs</span> (<span class="global">require</span> <span class="string">"posix.stdio"</span>) <span class="keyword">do</span>
<span class="keyword">if</span> <span class="global">type</span> (value) == <span class="string">"number"</span> <span class="keyword">then</span>
<span class="global">print</span> (name, value)
<span class="keyword">end</span>
<span class="keyword">end</span></pre>
</ul>
</dd>
</dl>
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